The walleye is oooold!
Found this piece of info.
Electro-optical [EO] sensors such as used on Walleye depend on both light and optical contrast for target searching and identification. This obviates their use at night and in significantly adverse weather or visual conditions where the line of sight to a target was obscured. The requirement for visual contrast between the target and its immediate surroundings imposed problems during Desert Storm. For Walleye delivery, F/A-18 pilots reported that a target was sometimes indistinguishable from its own shadow. This made it difficult to reliably designate the actual target, rather than its shadow, for a true weapon hit. The the low-light conditions at dawn and dusk often provided insufficient light for the required degree of optical contrast. A "haze penetrator" version of Walleye used low-light optics to see through daytime haze and at dawn and dusk, permitting use in some of the conditions in which other optical systems were limited.